标题: Effect of ZrO2 Crystal Structures on the Catalytic Performance of MnOx-CeO2/ZrO2 for Selective Reduction of NO with NH3 at Low Temperature
作者: Xu, Yifan
Liu, Rong
Jia, Feng
Ji, Lingchen
Ye, Fei
環境工程研究所
Institute of Environmental Engineering
关键字: Selective Catalytic Reduction;Zirconia Polymorphs;Low Temperature;SO2 Poisoning
公开日期: 1-十二月-2017
摘要: A series of manganese oxide and cerium oxide catalysts supported on monoclinic zirconia (m-ZrO2), tetragonal zirconia (t-ZrO2) and cubic zirconia (c-ZrO2) were prepared by a wet-impregnation method. The catalytic performance and SO2 tolerance for the selective reduction (SCR) of NOx with NH3 were investigated. Measurements were carried out in a fixed-bed reactor. The results suggested that both SCR activity (NO conversion on the catalysts) and SO2 tolerance of the prepared catalysts decreased in the following order: 5 wt.% MnOx-CeO2/c-ZrO2(5c) > 5 wt.% MnOx-CeO2/t-ZrO2(5t) > 5 wt.% MnOx-CeO2/m-ZrO2(5m) Surface properties are discussed by using XRD, BET, SEM, XPS, TPR, TPD and TG-DTA, FT-IR. 5 wt.% MnOx-CeO2/c-ZrO2 catalyst exhibited the best redox property and the highest adsorption capacity for NH3 while 5 wt.% MnOx-CeO2/m-ZrO2 and 5 wt.% MnOx-CeO2/t-ZrO2 catalysts exhibited relatively poor performance. Also, there existed the largest density of acid sites and highest strength of acidity when c-ZrO2 was used as carrier. The deterioration of active component and deposition of NH4HSO4, (NH4)(2)SO4 or metallic sulfites were identified as the main causes of SO2 poisoning.
URI: http://dx.doi.org/10.1166/sam.2017.3124
http://hdl.handle.net/11536/144354
ISSN: 1947-2935
DOI: 10.1166/sam.2017.3124
期刊: SCIENCE OF ADVANCED MATERIALS
Volume: 9
起始页: 2104
结束页: 2113
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